First, especially for the underwater thing, air pressure is an issue. With high water pressure, the habitat must withstand that pressure, and not expose humans to excessive pressures. Thick air can become toxic even if the pressure doesn’t crush you. Living at the top of Mount Everest has the reverse issue in that air is dangerously thin and most people need supplemental oxygen at those high altitudes.
Second… there’s not much in terms of energy, water, and food in these locations. Deep underwater means oceans which means salt water, which needs purifying to be safe to drink. You’ll need supplies delivered regularly, or some means to produce your own.
Possible in our lifetimes? Maybe. Viable? I’m gonna say no. Mount everest is a tourist attraction today, and maybe underwater/deep in the earth could become that as well some day, but that only works because tourists pay to visit. To live there permanently without said tourist dollars or something… no.
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